Dispensing apparatus and interlocking mechanism therefor



July 20, 1943. H. F. SOPER: 2,324,734

DISPENSING APPARATUS AND INTERLOCKING MECHANISM TMEREFOR Filed Oct. 16, 1940 3 Sheets-Sheet l 5 I t- 15 I Q0 56 00 70 INV TQR Henry/1X01? i 4 ATTORNEYS July 20, 1941 H. F. SOPER 22,324,734

DISPENSING APPARATUS AND INTERLOCKING MECHANISM THEREFOR Filed Oct. 16, 1940 3 Sheets-Sheet 2 INVENTOR A ATZ'ORNEYS Jul 20, 1943 H. F, SQPER 2,32%,734

DISPENSING APPARATUS AND INTERLOCKING MECHANISM THEREFOR Filed on. 16, 1940 5 sheets-shes: a

INVENTOR A ATToRNEYs Patented July 20, 1943 DISPENSING APPARATUS AND INTERLOCK- ING MECHANISM THEREFOR Henry Felix Soper, East Orange, N. J., assignor to Neptune Meter Company, a corporation of New Jersey Application October 16, 1940, Serial No. 361,355

17 Claims. (Cl. 221-101) This invention relates to liquid dispensing apparatus and more particularly to an interlockin: mechanism for dispensing apparatus or the like having manually settable compensating means to insure proper setting thereof.

It has heretofore been proposed to provide meters of liquid dispensing apparatus with means to compensate for variations in the volume of a liquid caused by changes in the temperature thereof. This was accomplished by providing the meter with means adjustable to vary the capacity of the meter and thereby compensate to: volumetric changes in the liquid, due to the co traction or expansion or the liquid at temperatures different from a predetermined or standard temperature, the adjustable means to be manually set to agree with the instant temperature conditions of the liquid being handled.

To obviate any fraudulent or improper use of such a manually settable means, I have invented f a new interlocking control for apparatus so equipped, one of the objects of the invention being to provide the apparatus with means to control the operation thereof in a manner to indicate whether or not the compensating means has been properly set.

Another object of the invention is to provide an interlocking control operable to compare the positions of two separately movable means to determine the operation of the control.

A further object of the invention is to provide liquid dispensing apparatus, equipped with a register and a meter having liquid condition compensating means, with means to prevent the preconditioning of the register for dispensing ing purposes unless the compensating means has been previously set to correspond substantially with the condition of the liquid to be dispensed.

An additional object of the invention is to provide a liquid dispensing apparatus, equipped with a ticket printing register and a meter having liquid condition compensating means, with means operable to prevent the printing operation should the compensating means be improperly set.

A still further object of the invention is to provide a dispensing apparatus with means to permit a dispensing operation only when the apparatus is set to compensate for an existing difference between the instant condition of the liquid and a predetermined standard.

The above mentioned and additional objects and features of the invention are obtained by providing a liquid dispensing apparatus comprising a meter having a manually settable liquid condition compensating means with means for mechanism which includes a planetary movement for comparing the indicated condition, such as the temperature of the liquid being dispensed, and the position at which the compensating means has been set. Where the condition of the liquid and the setting of the compensating means exactly or substantially correspond, the control element will be so positioned as to permit normal dispensing operations. Should the condition of the liquid and the setting of the compensating means not correspond, the control element will then be displaced from the operative position to an inoperative position, whereupon normal operation of the dispensing apparatus is prevented.

The interlocking control feature of the invention may be associated with various makes oi dispensing apparatus with or without registering means. It should also be understood that my in vention is not limited to liquid dispensing apparatus but is readily adapted for use with various 7 other apparatuses as well.

For the purposeof illustrating the invention a dispensing apparatus provided with a ticket printing register has been selected. This register is of the type adapted to be preconditioned by the insertion of a ticket and the performance of a resetting operation prior to dispensing 0! liquid, the ticket being printed upon the termination of the dispensing operation to record the amount dispensed. The control feature in one form of the invention prevents the resetting of the register when the compensating means have not been properly set, while in another form the control feature prevents the insertion of a ticket.

Where the dispensing apparatus includes an automatic cut-oil mechanism adapting the apparatus to be preset to deliver a predetermined amount and to automatically discontinue deliv- 'tageou'sly assocla nlsm.

' ctsntially along line 6-4 ..d with such cut-oii mecha- For a better understanding of the invention,

reference. is had to thefollowing detailed description, to be read in connection wtih the accompanying inwhich:

Figure l. is a vertical sectional View with parts brohen' away showing a dispensing apparatus provided with one or the embodiments of the present invention;

Figures 2% Md 3 taken substantially along lines respectively, of Figure 1:

Figure 4 is a horizontal sectional view showing the meter and compensating means taken subof Figure i;

Figure 5 is a bottom. plan view with parts in cectlonshowing the adjustment feature of the compensating meam, taken substantially along line oi Figure l;

- Figure a is a view of a monies form of the are views in vertical elevation 2-2 and 8-3,.

' invention, and I 1 Figure "Z is a diagraatical illustration of another modified arrangement of the invention.

Referring to higal to 5. of the drawings, a term of'dlspensing apparatus is shown for purposes ar-illustrating the present invention This apparatus comprises a meter it having manually rotatable capacity veriating or compensating means it and a ticket, printing register it inciug a predetened auto-stop device 56 shown combination with. a form of my novel 'interlcc control mechanism iii. The meter 60' capacity compensating means 02 so iected for purposes of illustration is of the type in the co-pending application oi Charles El. Hazard, Eeriai No. 388,305, tiled June 1, 1940, now i atent No. 2.286.411, issued June 16, 1942. The ticlret printing register is of the type disclosed in patent to Hazard et al. No. 2,126,256.

To. better understand the meter and the associated capacity compensating feature, the construction thereof will be briefly described.

The meter it comprises a casing 55 provided with. end plates iii and iii to form a chamber 2i having an inlet 22 and an outlet 23. A rotor 26 is mounted within the chamber 2i and is provided. with a cylindrical body portion disposed .lZl sealing relation with a portion 25 of the walls The opposite wall surface 2d of the chamber is spaced from the rotor 2:3 to provide a passage for the flow of liquid from the inlet 22 to the outlet 23. The rotor is formed with end members 2i and 28 (Fig. l) which are oi? the chamber.

provided with suitable hub portions surroundlng bosses 3i) and ill of the end plates 59 and it, respectively. The end member ll of the ro tor is suitably geared to the meter shaft 535 at 3 3. The wall surface (Fig. 4) cooperates with a series of slidable vanes 3i, 3% and iii carried icy the rotor 26 and are operated by eccentrics GB end ii carried by the shaft 85, to successively pockets G2 to control the passage of liquid to on the inlet and outlet openings.

ltelerring to the capacity compensating means with which the meter lid is provided (Figs. 1, 4i and 5) the rotor 26 carries two capacity compensating piston-like elements 555 and S6. arranged for reciprocating movement radially of the rotor similarly as in the case of the vanes 88 to 39. The radial positioning of the pistons 35 and i6 and therefore the degree of compensation efiected during rotation of the rotor is controlled by an adjustable eccentric 5% against which. the rollers 59 hear. The adjustable eccentric Bill is shown in Figs. 1 and 5 as being provided with suitable mounting extensions, such as the member 52 and the bosses 53 and 56. The member 62 is provided with a slot 5 5 which receives a stationary pin 55. The boss 53 is threaded to receive the threaded portion 5t of a shaft to which extends through the bosses 58 and 5G. The inner end of the shaft 69 is received in a bearing 62 while the opposite end of the shaft is received in a bearing 63, the bearings being formed in the end plate 2%. The bearing 63 is provided with an enlarged recess 66 to receive a collar (is secured to the shaft St to maintain the shaft against axial movement. The shaft to is extended through the casing l8 and an associated compartment t8, the outer end of the shaft being provided with a manually actuatable knob it. The knob To (Fig. l) is calibrated at it to indicate the capacity correction at which Within the com at til. The ticket printing feature of the register it comprises a plurality of numeral wheels 82 which are viewable through the window 83. The numeral wheels 82 are driven from the shaft it through a gear train 8 3, shaft 85 and a worm and worm gear connection The printing wheels ill which correspond to the numeral wheels 82 are connected thereto by idler gears 88 so that the printing wheels are operated in unison with the wheels 82 during both counting and resetting operations. Below the printing wheels 9. slot 98 is defined by a pair of plates 9! adapted to receive a ticket on which an impression is made from the printing wheels through apertures 92 in the plates 9i by means of hammers 96 of an oscillatable printing platen rotatably mounted on shaft 96.

The operation of the printing hammers 9S and the resetting of the numeral and printing wheels 82 and iii are determined by a cyclic operation of an osclllatable reset lever 9? which controls the oscillations of an arm $8 rotatably mounted on a cam shaft iilll (Fig. l). The arm 98 carries a pawl Wt adapted to engage a three-toothed ratchet EM, fixed to the shaft Hill and operable to turn the shaft one-third of a revolution each time the arm 95 is oscillated by an action depressing the lever ill. A gear I05 rotatably mounted on the shaft iflfi carries a second ratchet Mil engageable by a second pawl H2. The gear iiiS meshes with a gear (not shown) carried by a reset shaft H3 upon which the numeral wheels 82 are mounted.

One of the notches N6 of the ratchet Hi l is of less depth than the other two notches. This enables the pawl, we to lift the pawl l l2, which in part overlaps the pawl i132, out of engagement with the ratchet Mil during every third actuation of the lever 9i. During this third actuation of the lever ill the printing mechanism is actuated while the reset shaft 553 and therefore the printing wheels 8? maintain stationary.

The shaft lfiil is provided with a cam H5 designed to actuate a three-armed member H6. One of the arms i it is provided with a roller lZfl adapted to engage the outer surface of the cam H5. Another of the arms I22 is adapted to enassumed. at

gage an abutment I23 on the platen 35 to effect a printing operation when the cam ismoved to g the point of releasing the roller I20. The arm I22 is also adapted by means of a lug 924 to engage a portion of the register frame to allow for a clearance and permit the hammers Q I to gravitate free of the ticket after -a printingoperation. The third arm I30 of the member IIB cooperates with the interlocking control to be later described. The member H6 is biased into cam engaging position by a suitable spring connection I25.

During the resetting movements of the shaft I00, the cam I I is moved from the position shown in Fig. 1 through two-thirds of a rotation so that the roller I comes to rest on the high portion of the cam and the reset shaft I I3 is turned sufliciently to insure complete resetting of the numeral and printing wheels 82 and 81. Upon the succeeding third of a rotation of the shaft I00, theabrupt portion I28 of the cam passes beneath the roller I20 permitting the spring to rotate the member H8 and platen 95 clockwise to effect the printing operation.

When this type of ticket printer is used on a delivery truck, the reset lever ordinarily is not operated to reset the numeral wheels after a printing operation until the truck reaches a new destination for the delivery of additional gasoline or other liquid. The ticket is then inserted in the slot 90 and the reset lever operated twice to reset the mechanism. Liquid is then delivered and upon completion of the delivery, the reset lever is depressed a third time to turn the shaft I00 through the final third of a revolution to actuate the printing mechanism and print the ticket. During the final third of a revolution of the shaft I00 when the printing operation is being performed the resetting shaft I I3 remains at rest due to the raising of the pawl M2.

7 Referring now to the interlocking mechanism (Figs. 1, 2 and 3), a control element I30 in the form of a disc having a slot I32 in the peripheral edge thereof is shown rotatably mounted on a shalt I34 suitably supported through the casing IS; The slot I32 of the control element is adapted to cooperate with the arm I36 of the member I I6 to control the operation of the ticket printing register. When the slot I32 is in operative position it will receive the arm I36 to permit the resetting of the numeral and printing wheels 82 and B1 preparatory for a dispensing operation. Such co-operatio'n of the control element indicates that the compensating means I2 associated with the meter I0 is properly set to compensate for any difference existing between the condition of the liquid being dispensed and a predetermined standard. Should the compensating means I2 not be properly set, the control element I30 would then be in an inoperative position so that the slot I32 would not receive the member I36 when a resetting or preconditioning operation is attempted. The attendant would then realize the trouble and thereupon correct the setting'of the compensating means.

The position of the control lement I30 is determined by a planetary gearing I40 which compares the setting of the compensating means l2 with respect to the actual condition of the liquid. While the illustration shows means for compensating for change in volume of th liquid due to changes in temperature, the compensation might b provided for other conditions, such as for difference in viscosity, pressure, etc., from a corresponding predetermined standard.

The comparison is performed through a conperature ofthe liquid at the source of supply the associated piping M8 is measured by a sui able thermal element l it which, through the medium of a fluid which communicates through a tube I49, controls the action of a Sylphon bal lows I (Figs. 1 and 3). One end of the bellows is supported by a bracket M32 and the other end is connected to .an index pointer i5 8 associated with a temperature scale M5 to indicate the temperature of the liquid. Also connected to the movable end of the bellows H0 is a rack ltd slid ably supported through a bracket I58 and meshing with a pinion I60 carried by the shaft tilt. Any movement or" the rack ltd is thereby transmitted through the shaft 534 to a sim gear l32 carried by the shaft M5. The control element I30 rotatably supports a pair of planet gears lot and IE5, at points diametrically opposite the shaft I34 for meshing engagement with the sun gear I62. The gear M5 is providedwith a peripheral flange I68 having internalgear teeth in mesh with the planet gear to l and lfiii.

When the compensating means l2 remains at one setting any change in temperature of the liquid causing the rack to move rotates the sun gear I02 and drives the planet gears ltd and I65. The planet gears being in mesh with the normally stationary gear I45 causes the control element E30 to change its position. Likewise, when the setting of the compensating means it is changed, the movement of the shaft is trans mitted through the bevel gear it and flexible shaft I42 and the gear llit to the gear i iii, which then drives the planet gears about the sun gear E62. This also changes the position of the control'element lSIl. When the setting of the cornpensating means it: corresponds substantially with the temperature of the liquid, the control element I30 will be in a position to receive the arm I36 and permit a normal dispensing operation.

. Since deliveries of oil or gasoline do not take much time, the temperature of the liquid is not apt to change sufficiently to vary the position of the control during a dispensing operation. Thus for normal dispensing operations the presetting of the compensating means it will permit the reconditioning or resetting of the ticket printing register so that at the end of the dispensing operation a ticket may be printed showing the exact amount delivered.

While the control element llii (Fig. 1) is shown associated with a particular part of the registering mechanism which operates to control the re setting of the register and therefore the printing operation, it is to be understood that the control element may also be associated with other parts of the register, or with registers of widely different constructions and uses, and with other parts of the dispensing apparatus or with apparatus designed for still other purposes.

Referring to Fig. 6, a modified arrangement of the invention is shown in which the control element Hill is provided with a slot iii} having knife edges ill adapted when in operative position to be in alignment with the ticket receiving slot 90. Should the control element 536 be moved to inoperative position, that is, with the slot till out of alignment with the slot 98, the ticket il could not then be properly positioned within the erly set.

slot to receive a printed record. Such refusal of the register to receive the ticket would then indlcate to the attendant that the compen aing means is improperly set. Any change in the setting of the knob ll after the ticket has been inasaafvec ratus with which it is associated only while the conditions represented by the two variables serted will cause the control element Q30 to move 1 relative to the slot, and by means of the knife edges Il'I, cut or otherwise damage the ticket. To indicate that any cut or damage to the ticket in the portion received by the control element indicates an improper operation, suitable notice is printed on the ticket, .such as: Shouldthe ticket be cut or damaged in this area, the dispausing apparatus for this delivery was improp This serves as anotice to customersand to the home ofiice that the delivery was not properly performed.

Where the dispensing apparatus It is provided with a predetermining automatic cut-off feature, such as the attachment I5 which enables the register to be preset to deliver a predetermined amount of liquid and then stop, the control element I538 may be advantageously associated with the cut-off feature thereof. While the automatic cut-ofi attachment I5 may take any one of several different forms and be used separately or in association with apparatus used for purposes other than the dispensing of liquid, I have shown in Fig. 7, for purposes of illustration, a fragmentary part only of an automatic cut ofi device. The piping i8 5 associated with the meter Ill is provided with an electromagnetic valve I85 which, when energized, is adapted to maintain the valve in open position. The solenoid I85 thereof is included in an electric circuit I81 containing two suitable switches I90 and I92. The switch I92 is associated with a cam I93, which is adapted to be preset to actuate the switch when the predetermined amount of liquid has been delivered, thereby effecting the closing or maintenance of the valve I85 in closed position. The switch I 90 which is in series with the switch I92, has a stem I95 arranged in cooperative relation with a suitable recess I95 contained in the control element I39. When the stem I95 is received in the recess I98, the switch will be in closed position, thereby permitting energization of the circuit i8? and the opening of the valve I135. Should the control element I30 move out of the operative position shown in Fig. 7, either in response to a change in the setting of the compensating means or by a change in the indicated temperature, the switch I90 will be actuated to break the controlling circuit to the solenoid I86.

This will stop or prevent the establishment of a g flow of liquid through the meter thereby indieating to the attendant that the setting of the compensating means no longer corresponds to the temperature of the liquid being handled. In order to establish or continue the delivery of liquid, the compensating means will then need readjustment.

In each of the illustrated forms of my invention, I have shown an apparatus having means movable in response to change in the condition of a variable and another means movable to represent a selected condition in combination with a control associated with some operable part of the apparatus and movable relative to a predetermined or operative position together with means for integrating the positions of the two movable means to determine the positioning of the control. My invention thus provides an interlock substantially correspond.

While I have shown and described one particular form of interlocking means and several different arrangements for controlling operations of a dispensing apparatus, it will be understood that many modifications of the interlocking menhamsm and the coactive arrangements thereof with respect to various parts of the dispensing apparatus and adaptations for use with other apparatus and more than two variables may be madewithout departing from the spirit of the lnvention. It should, therefore, be further understood that the forms of the invention herein illustrated and described are intended to he illustrative of the invention only and not as limiting the scope thereof.

I claim:

1. In liquid dispensing apparatus, a liquid measuring device, means to indicate the condition of liquid encountered in the operation of .said device, means manually settable to vary the indicated condition of saidfliquid, and interlocking means to prevent operation of said device except when the manually settable means is set in agreement with the indicated condition of said liquid.

2. In liquid dispensing apparatus, a liquid measuring device, means to indicate the condition of liquid encountered in the operation or said device, means manually settable to vary the operation of said device in accordance with the indicated condition of said liquid, a movable element operable when moved away from a predetermined position to prevent operation of said device, and means operatively associated with the condition indicating means and the manually settable means to maintain said element in said predetermined position only while the setting of said settable means substantially corresponds with the indicated condition of said liquid.

3. In liquid dispensing apparatus, a liquid measuring device, means to indicate the condi tion of liquid encountered in the operation of said device, means manually settable to vary the operation of said device in accordance with the indicated condition of said liquid, a movable element operable when moved away from a predetermined position to prevent operation of said device, and means including a planetary movement having parts operatively connected to the indicating means, the manually settable means and said element to maintain said element in said predetermined position only while the setting of said settable means substantially corresponds with the indicated condition of said liquid.

4. In liquid dispensing apparatus, a liquid measuring device, means toindicate the condltion of liquid encountered in the operation of said device, means manually settable to vary the operation of said device in accordance with the indicated condition of said liquid, an element movable relative to a predetermined position to control the operation of said device, and means controlling the position of said element comprising a sun gear operatively connected to said condition indicating means, a planet gear rotatably carried on said element and meshing with said sun gear, and a gear operatively connected to said manually settable means meshing with said planet gear.

5. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including an element movable relative to a predetermined position to control the operation of the dispensing apparatus, and means operable upon variance between the position of said movable means and the setting of said manually operable means to move said element with respect to said predetermined position.

6. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means for indicating the condition of a variable encountered in the dispensing of liquids and means manually operable to set said compensating means in accordance to the indicated condition of said variable; the combination therewith of means including an element movable relative to a predetermined position to control the operation of the dispensing apparatus, and means operatively associated with said indicating means and said manually operable means to maintain said element in said predetermined position only while the setting of said manually operable means corresponds substantially with the indicated condition of said variable.

7. In liquid dispensing apparatus comprising -a meter, capacity compensating means for said meter, means for indicating the temperature of the liquid being dispensed and means manually operable to set said compensating means in accordance to the indicated temperature; the combination therewith of means including an element movable relative to a predetermined position upon variance between the setting of said manually operable means and the indicated temperature to prevent operation of the dispensing apparatus, and means operatively associated with said indicating means and said manually operable means to maintain said element in said predetermined position only while the setting of said manually operable means corresponds substantially with the indicated temperature.

8. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including an element movable relative to a predetermined position to control the operation of the dispensing apparatus, and means controlling the position of said element including a planetary movement comprising a plurality of parts, one of the parts being operatively connected to said movable means, another of the parts being operatively connected to said manually operable means and still another of the parts being operatively connected to said element.

9. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including an element movable relative to a predetermined position to control the opera tion of the dispensing apparatus, and interconnecting gearing controlling the position of said element comprising a sun gear operatively connected to said movable means, a planet gear rotatably carried by said element and meshing with said sun gear and means having teeth meshing with said planet gear and operatively connected to said manually operable means.

10. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including a ticket printing register driven by said meter and an element movable between operative and inoperative positions to control the printing of a ticket, and means operable in response to variance between the setting of said manually operable means and the condition of the liquid to determine the position of said element.

11. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of a register driven by said meter, said register being of the type adapted to be reset prior to each dispensing operation, an element movable between operative and inoperative positions to control the resetting of said register, and means operable in response to variance between the setting of said manually operable means and the condition of the liquid to determine theposition of said element.

12. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including a ticket printing register driven by said meter and an element movable between ticket obstructing and ticket non-obstructing positions, and means operatively associated with said movable means and said manually operable means to maintain said element out of said ticket obstructing position only while the setting of said manually operable means corresponds substantially with the condition of said liquid.

13. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to a change in condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including a ticket printing register driven by said meter and a slotted element adapted to receive the ticket for printing purposes when said element is in a predetermined position, and means operatively associated with said movable means and said manually operable means to maintain said element in said predetermined position only while the setting of said manually operable means corresponds substantially with the condition of said liquid.

14. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to a change in condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including means to control the flow of liquid through said meter and a movable element cooperatable therewith in one position to permit liquid flow and in another position to prevent liquid flow, and means operable in response to change in corresponding positions of said movable means and said manually operable means to determine the position of said element.

15. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of a valve to control flow of liquid through said meter, means for controlling the opening and closing of said valve, a movable element cooperatable with said valve controlling means to permit the opening of said valve when in one position and to eifect the closing of the valve when in another position, and means operable in response to change in corresponding positions of said movable means and said manually operable means to determine the position of said element.

16. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in response to change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of means including an automatic cut-01f device for controlling the flow of a predetermined amount of liquid through said meter and an element operable when in one position to permit the establishment of liquid flow by operation of said device, and when in another position to prevent the flow of liquid, and means operable in response to change in corresponding positions of said movable means and said manually operable means to determine the position of said element.

17. In liquid dispensing apparatus comprising a meter, capacity compensating means for said meter, means movable in responseto change in a condition of the liquid being dispensed and means manually operable to set said compensating means in accordance to the condition of the liquid; the combination therewith of an electromagnetic valve for controlling flow of liquid through said meter, means including a switch to control ,said valve, an element operable in one position 

